html {
    background: #000;
    color: #666;
    font-size: 12px;
    overflow: hidden;
}

* {
    margin: 0;
    padding: 0;
}

span {
    display: block;
    float: left;
}

.on {
    color: #fff;
}

.wrapper {
    width: 200px;
    height: 200px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-top: -100px;
    margin-left: -100px;
}

.wrapper .timebox {
    position: absolute;
    width: 200px;
    height: 200px;
    top: 0;
    left: 0;
    border-radius: 100%;
    transition: all 0.5s;
}

.timebox span {
    transition: all 0.5s;
    float: left;
}

.wrapper .timebox span {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 40px;
    height: 18px;
    margin-top: -9px;
    margin-left: -20px;
    text-align: right;
}